We report a precision characterization of the ${}^{2}F_{5/2}$ state in ${}^{171}\mathrm{Yb}^{+}$, including its energy relative to the ${}^{2}D_{3/2}$ state, lifetime, hyperfine splitting, and Landé $g_J$ factor. The state is probed via the ${}^{2}D_{3/2}\to {}^{2}F_{5/2}$ transition at 1161.8 nm, driven by a diode laser. We stabilize and accurately measure its frequency using an optical frequency comb, referenced to a stable 1140-nm laser and an active hydrogen maser. The ${}^{2}F_{5/2}$ state in ${\mathrm{Yb}}^{+}$ with an observed lifetime of 589(53) $\mu \mathrm{s}$ offers the potential for additional degrees of freedom for quantum information processing and testing quantum many-body calculations in ${}^{171}\mathrm{Yb}^{+}$.

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• Electronic transitions
• Fine & hyperfine structure